FAIRMol

MK21

Pose ID 9086 Compound 1012 Pose 278

DB fairmolDocking pose analysis is being read from this database.
Molecular metrics status: done
RDKit SASA-based burial metrics are cached.
SASA cached
T14
T. brucei ODC (G418 binding site) T. brucei G418 binding site
Ligand MK21
PDB1NJJ

3D complex viewer

Strict H-bonds Permissive H-bonds
Viewer legend
Protein receptor
Pocket residues
Cofactor context
Docked ligand
Overall assessment
Reject SASA cached
Promising but geometrically suspicious
Binding strong Geometry low Native strong SASA done
Strain ΔE
47.1 kcal/mol
Protein clashes
0
Internal clashes
14
Native overlap
contact recall 0.60, Jaccard 0.45, H-bond role recall 0.40
Burial
69%
Hydrophobic fit
86%
Reason: 14 internal clashes, strain 47.1 kcal/mol
strain ΔE 47.1 kcal/mol 14 intramolecular clashes
Molecular report
Full metrics ↗
Reject Multiple quality flags — this pose should be deprioritised or discarded.
✓ Excellent LE (-0.742 kcal/mol/HA) ✓ Good fit quality (FQ -7.42) ✓ Good H-bonds (4 bonds) ✓ Deep burial (69% SASA buried) ✓ Lipophilic contacts well-matched (86%) ✗ Extreme strain energy (47.1 kcal/mol) ✗ Geometry warnings ✗ Many internal clashes (14)
Score
-25.227
kcal/mol
LE
-0.742
kcal/mol/HA
Fit Quality
-7.42
FQ (Leeson)
HAC
34
heavy atoms
MW
490
Da
LogP
0.97
cLogP
Final rank
3.7154
rank score
Inter norm
-0.765
normalised
Contacts
14
H-bonds 6
Strain ΔE
47.1 kcal/mol
SASA buried
69%
Lipo contact
86% BSA apolar/total
SASA unbound
804 Ų
Apolar buried
475 Ų

Interaction summary

HBD 2 HBA 2 HY 6 PI 0 CLASH 0

HBD/HBA · H-bonds (geometric)

HBD = ligand donates H · HBA = ligand accepts H · ~ = weak (≥110°). Mode: strict. Residues: 3.

PI · π–π interactions

No pi · π–π interactions detected for this pose.

HY · Hydrophobic contacts

CLASH · Clashes

No clash · clashes detected for this pose.

Native ligand reference

★ reference
Interaction fingerprint calculated directly from the uploaded native ligand without docking. Current H-bond mode: strict.
Name1NJJContacts15
PoseOpen native poseHB0
IFP residues
ARG22 ARG242 ARG337 ARG342 ASP243 ASP385 GLN341 GLU384 LEU25 LEU339 LEU382 PRO340 PRO344 SER282 THR241
Current overlap9Native recall0.60
Jaccard0.45RMSD-
HB strict2Strict recall0.33
HB same residue+role2HB role recall0.40
HB same residue2HB residue recall0.40

Protein summary

398 residues
Protein targetT14Atoms6140
Residues398Chains1
Residue summaryVAL:592; LEU:513; LYS:484; ARG:432; PHE:420; ILE:418; ASP:349; THR:322; TYR:315; PRO:308; GLU:301; ALA:290; SER:253; GLY:217; ASN:210; GLN:170

Receptor context

1 kept / 0 excluded
Receptor context filtering: interactions and SASA are computed against protein atoms plus allowed cofactors/ions. Native ligand-like HETATM partners are excluded from scoring.
Kept context 1 Excluded HETATM 0
Kept cofactors / ions
A:ORX602

All stored poses for this docking hit

PoseFinal rankInter normScoreHBCTCT overlapCT recallHB role rec.RMSDExcluded
300 3.4559320739769754 -0.746738 -23.5528 2 20 0 0.00 0.00 - no Open
278 3.7154167449283855 -0.765126 -25.2273 6 14 9 0.60 0.40 - no Current

Molecular metrics

RDKit SASA burial, strain energy (MMFF94s), ligand efficiency and fit quality for this docking pose.
✓ Metrics available

Scoring & efficiency

Docking score -25.227kcal/mol
Ligand efficiency (LE) -0.7420kcal/mol/HA
Score / heavy atom count
Fit quality (FQ) -7.424
LE / (0.072 + 0.95/HAC) — Leeson & Springthorpe
Heavy atom count 34HA

Physicochemical properties

Molecular weight 489.7Da
Lipinski: ≤ 500 Da
LogP (cLogP) 0.97
Lipinski: ≤ 5
Rotatable bonds 7

Conformational strain (MMFF94s)

Strain energy (ΔE) 47.12kcal/mol
< 5 good · 5–10 marginal · > 10 problematic
Docked FF energy 164.71kcal/mol
Minimised FF energy 117.60kcal/mol

SASA & burial

✓ computed
SASA (unbound) 803.7Ų
Total solvent-accessible surface area of free ligand
BSA total 552.4Ų
Buried surface area upon binding
BSA apolar 474.9Ų
Hydrophobic contacts buried
BSA polar 77.5Ų
Polar contacts buried
Fraction buried 68.7%
> 60 % indicates good pocket engagement
Lipophilic contact ratio 86.0%
BSA apolar / BSA total — high = hydrophobic driver
Δ Non-polar SASA -2676.7Ų
SASA_nonpolar(complex) − SASA_nonpolar(receptor) − SASA_nonpolar(ligand free). Negative = non-polar surface buried upon binding. Requires full polarity-decomposed SASA computation.
Receptor non-polar SASA 3349.0Ų
Non-polar SASA of receptor alone (VdW proxy, nonpolar atoms only)
Complex non-polar SASA 1372.5Ų
Non-polar SASA of full complex (VdW proxy, nonpolar atoms only)